AFNetworking/AFNetworking — pull request #290 by steipete (2012-04-10 22:58:11+00:00)
Title: don't use NSInvocation if we can be sure that NSJSONSerialization...

is available.

Small fix, but makes the code a lot nicer (at least for the compiler) on iOS5. Also, is faster then the NSInvocation call.